Index: astrolabe.lua
==================================================================
--- astrolabe.lua
+++ astrolabe.lua
@@ -121,13 +121,14 @@
 			note = 'Unravel the secrets of the stars';
 		};
 	};
 })
 
+local m = sorcery.data.metals
 minetest.register_craft {
 	output = 'sorcery:astrolabe';
 	recipe = {
 		{'sorcery:steel_screw','default:steel_ingot','sorcery:steel_screw'};
-		{'default:copper_ingot',sorcery.data.metals.brass.parts.block,'default:copper_ingot'};
+		{m.copper.parts.disc,m.brass.parts.block,m.copper.parts.disc};
 		{'default:stick','sorcery:screw_steel','default:stick'};
 	};
 };

Index: displacer.lua
==================================================================
--- displacer.lua
+++ displacer.lua
@@ -197,13 +197,17 @@
 			-- iterate through available receptacles and see if there's room
 			-- in any of them. otherwise, fail
 			for _,r in pairs(remote.receptacles) do
 				local i = minetest.get_meta(r):get_inventory()
 				transmission = i:add_item('cache',transmission)
+				minetest.sound_play('sorcery_zap', { gain = 0.5, pos = r })
 				if transmission:is_empty() then break end
 			end
-			if not transmission:is_empty() then inv:add_item('cache',transmission) end
+			if not transmission:is_empty() then inv:add_item('cache',transmission) else
+				minetest.sound_play('sorcery_zap', { gain = 0.5, pos = pos })
+			end
+			-- TODO add particle fx as well
 			return true
 		elseif n.maxpower >= n.self.maxpower then
 			-- other devices are currently drawing power and might stop,
 			-- making enough available for us; keep iterating just in case
 			return true